I'm having trouble with this because the elements i'm pulling from have multiple attributes with the same name. So in the example below, I want to pull the last_child, but only where the Phone "name" attribute is "cell". 
<Person name="Brian">
        <Phones>
          <Phone name="cell" number="5551112233" />
          <Phone name="cell" number="5557778899" />
          <Phone name="home" number="5554441122" />
        </Phones>
      </Person>

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In reply to Need XMLTwig help by perlvroom

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